4. Choose the appropriate answer for each of these questions: A. The derivative of a function measures: a. How steep its graph is b. What value it takes for a given x C. Where its graph crosses the x-axis B. The derivative of a function at a given point is a: a. An equation b. A number C. A function C. The derivative of a function is closely related to the a. Set of solutions of an equation b. Slope of a line c. Zero of a function